Towards All Optical, Universal Quantum Computation using Trapped Electron Spins and Cavity Polariton Resonance

TL;DR

This paper proposes an all-optical quantum computing scheme using trapped electron spins and cavity polariton resonance, enabling universal quantum gates with minimized errors for potential practical realization.

Contribution

It introduces a novel all-optical approach for quantum computation with trapped electron spins and cavity polaritons, including optimized single-qubit rotations and a universal gate set.

Findings

Single qubit rotation with minimized errors

Implementation of a two-qubit controlled-z gate

Potential for physical realization of universal quantum computer

Abstract

We propose an all optical quantum computation scheme, with trapped electron spin qubits, using their Coulomb exchange interaction with optically excited microcavity exciton-polaritons. This paper describes a single qubit rotation, which together with two-qubit controlled-z gate presented in PRB 85, 241403(R) (2012), form a set of universal logic gates. The errors due to finite cavity lifetime and incorrect orientation of the rotation axis are minimized by optimizing pump pulse parameters. With projective homodyne phase measurement and initialization, our scheme is a promising candidate for the physical realization of a universal quantum computer.